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Aspect Ratio
The ratio between the width and height of the TV picture on the screen. In a normal TV set the aspect ratio is 4
to 3 (4:3). The new aspect ratio in HDTV is 16:9 which resembles the aspect ratio in a movie theatre
(Widescreen).
New TV systems support both 4:3 and 16:9 aspect ratio and can automatically
switch between
them.
Audio Video (A/V)
A term often used when discussing a channel on a TV receiver or on video equipment,
which has been
especially designed to accept VCR audio-video signals. This channel automatically
activates special circuitry
within the TV set to prevent picture distortion and skewing. It is also used for audio-video
processors, which
handle both types of signals.
ATSC
ATSC: Advanced Television Systems Committee.
Formed to establish technical standards for advanced
television systems,
including digital high definition television (HDTV).
CVBS
Composite Video Baseband
Signal.
In broadcast television this refers to the video signal,
including the colour information and syncs
DTV
Digital television.
Generic term that refers to all digital television formats, including high-definition
television
(HDTV) and standard-definition
television (SDTV).
DOLBY Digital
Dolby Digital - Six-channel
digital audio standard that is part of the U.S. digital television standard; also called AC-3 or Digital
5.1. The channels consist of front left, front right, front center, surround or rear left, surround or rear right, and a separate
subwoofer
Digital Tuner
A digital tuner serves as the decoder required to receive and display digital broadcasts.
It can be included inside TV sets or
via a set-top box.
HDTV
The generally agreed upon definition of HDTV is approximately
twice the vertical and horizontal picture resolution of today's
NTSC TV, which essentially makes the picture twice as sharp. HDTV also has a screen ratio of 16:9 as compared with most of
today's TV screens, which have a screen ratio of 4:3. HDTV offers reduced motion artifacts (i.e. ghosting, dot crawl), and
offers 5.1 independent
channels of CD-quality stereo surround sound, (also referred to as AC-3).
NTSC
National television system committee. The organization
that developed
the analog television standard currently in use in the
U.S. Canada, and Japan. Now generally used to refer to that standard. The NTSC standard combines
blue, red, and green
signals modulated as an AM signal with an FM signal for audio.
Progressive
Scan
In Progressive Scanning all the horizontal scan lines are scanned on to the screen at one time. The Digital TV and HDTV
Standards accept both Interlaced Scan and Progressive Scan broadcast and display methods.
Resolution
Resolution: A measurement
of the finest (smallest) detail that is visible in a video image. TV Resolutions
may be expressed
as
number of pixels in an image; or more commonly, "As Total Number of (horizontally
scanned) Lines used to create the image.
Standard Digital TV Resolutions:
SDTV: 480i - The picture is 704x480 pixels, 480p - The picture is 704x480 pixels.
HDTV: 720p - The picture is 1280x720 pixels, 1O8Oi - The picture is 1920x1080
pixels, 1O8Op - The picture is 1920x1080
pixels.
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